National Primary Drinking Water Regulations

Contaminant MCL or Potential health effects from Common sources of contaminant Public Health
 

 TT1 (mg/L)2 long-term3 exposure above the MCL in drinking water Goal (mg/L)2
 

OC Acrylamide TT4 Nervous system or blood problems; Added to water during sewage/ zero increased risk of cancer wastewater treatment 

OC Alachlor 0.002 Eye, liver, kidney or spleen problems; Runoff from herbicide zero 

anemia; increased risk of cancer used on row crops 

 

 

R Alpha/photon emitters 15 picocuries Increased risk of cancer Erosion of natural deposits of certain zero 

per Liter minerals that are radioactive and 

(pCi/L) may emit a form of radiation known

as alpha radiation 

IOC Antimony	 0.006		 Increase	in	blood	cholesterol;	decrease	 Discharge	from	petroleum	refineries;	 0.006

in	blood	sugar	 fire	retardants;	ceramics;	electronics;

solder 

IOC Arsenic 0.010 Skin damage or problems with circulatory Erosion of natural deposits; runoff 0 

systems, and may have increased from orchards; runoff from glass & 

risk of getting cancer electronics production wastes 

IOC Asbestos	(fibers	>10	 7	million	 Increased	risk	of	developing	benign	 Decay	of	asbestos	cement	in	water	 7	MFL

micrometers)	 fibers	per	 intestinal	polyps	 mains;	erosion	of	natural	deposits

Liter	(MFL)

OC Atrazine 0.003 Cardiovascular system or reproductive Runoff from herbicide used on row 0.003 

problems crops 

IOC Barium 2 Increase in blood pressure Discharge of drilling wastes; discharge 2 

from	metal	refineries;	erosion

of natural deposits 

OC Benzene 0.005 Anemia; decrease in blood platelets; Discharge from factories; leaching zero increased	risk	of	cancer	 from	gas	storage	tanks	and	landfills

OC Benzo(a)pyrene	 0.0002	 Reproductive	difficulties;	increased	risk	 Leaching	from	linings	of	water	storage	 zero (PAHs) of cancer tanks and distribution lines 

IOC Beryllium		 0.004		 Intestinal	lesions		 Discharge	from	metal	refineries	and	 0.004

coal-burning factories; discharge

from electrical, aerospace, and

defense industries 

R Beta photon emitters 4 millirems Increased risk of cancer Decay of natural and man-made zero 

per year deposits of certain minerals that are

radioactive and may emit forms of

radiation known as photons and beta

radiation 

DBP Bromate 0.010 Increased risk of cancer Byproduct of drinking water disinfection zero 

IOC Cadmium 0.005 Kidney damage Corrosion of galvanized pipes; erosion 0.005 

of natural deposits; discharge 

from	metal	refineries;	runoff	from

waste batteries and paints 

OC Carbofuran 0.04 Problems with blood, nervous system, or Leaching of soil fumigant used on rice 0.04 

reproductive system and alfalfa 

OC Carbon tetrachloride 0.005 Liver problems; increased risk of cancer Discharge from chemical plants and zero 

other industrial activities 

D Chloramines (as Cl )	 MRDL=4.01 Eye/nose	irritation;	stomach	discomfort;	 Water	additive	used	to	control	 MRDLG=41 

2

anemia microbes 

OC Chlordane 0.002 Liver or nervous system problems; Residue of banned termiticide zero increased risk of cancer 

D Chlorine (as Cl )	 MRDL=4.01 Eye/nose	irritation;	stomach	discomfort	 Water	additive	used	to	control	 MRDLG=41 

2

microbes 

D Chlorine	dioxide	 MRDL=0.81 Anemia;	infants,	young	children,	and	fetuses	of	 Water	additive	used	to	control	 MRDLG=0.81 

(as ClO ) pregnant women: nervous system effects microbes 2

DBP Chlorite	 1.0	 Anemia;	infants,	young	children,	and	fetuses	of	 Byproduct	of	drinking	water	 0.8

pregnant women: nervous system effects disinfection 

OC Chlorobenzene 0.1 Liver or kidney problems Discharge from chemical and agricultural 0.1 

chemical factories 

IOC Chromium (total) 0.1 Allergic dermatitis Discharge from steel and pulp mills; 0.1 

erosion of natural deposits 

IOC Copper TT5

;	 Short-term	exposure:	Gastrointestinal	 Corrosion	of	household	plumbing	 1.3

Action distress. Long-term exposure: Liver or systems; erosion of natural deposits 

Level	=	 kidney	damage.	People	with	Wilson’s

1.3 Disease should consult their personal

doctor if the amount of copper in their

water exceeds the action level 

M Cryptosporidium TT7 Short-term	exposure:	Gastrointestinal	illness	 Human	and	animal	fecal	waste	 zero (e.g., diarrhea, vomiting, cramps) 

LEGEND 

D Disinfectant IOC Inorganic Chemical OC Organic Chemical 

DBP Disinfection Byproduct M Microorganism R Radionuclides
Contaminant 

 

MCL or 

TT1 (mg/L)2 

Potential health effects from 

long-term3 exposure above the MCL 

Common sources of contaminant 

in drinking water 

Public Health 

Goal (mg/L)2 

IOC 

OC 

Cyanide 

(as free cyanide) 

2,4-D	

0.2 

0.07	

Nerve damage or thyroid problems 

Kidney,	liver,	or	adrenal	gland	problems	

Discharge from steel/metal factories; 

discharge from plastic and fertilizer

factories 

Runoff	from	herbicide	used	on	row	

0.2 

0.07

crops 

OC 

OC 

Dalapon	

1,2-Dibromo-3-	

chloropropane

(DBCP) 

0.2	

0.0002	

Minor	kidney	changes	

Reproductive	difficulties;	increased	risk	

of cancer 

Runoff	from	herbicide	used	on	rights	

of way 

Runoff/leaching	from	soil	fumigant	

used on soybeans, cotton, pineapples,

and orchards 

0.2

zero

OC o-Dichlorobenzene 0.6 Liver, kidney, or circulatory system 

problems 

Discharge from industrial chemical 

factories 

0.6 

OC p-Dichlorobenzene	 0.075	 Anemia;	liver,	kidney	or	spleen	damage;	

changes in blood 

Discharge	from	industrial	chemical	

factories 

0.075

OC 1,2-Dichloroethane 0.005 Increased risk of cancer Discharge from industrial chemical 

factories 

zero 

OC 

OC 

OC 

1,1-Dichloroethylene	

cis-1,2-Dichloroethylene	

trans-1,2­

Dichloroethylene 

0.007	

0.07	

0.1 

Liver	problems	

Liver	problems	

Liver problems 

Discharge	from	industrial	chemical	

factories 

Discharge	from	industrial	chemical	

factories 

Discharge from industrial chemical 

factories 

0.007

0.07

0.1 

OC Dichloromethane 0.005 Liver problems; increased risk of cancer Discharge from drug and chemical 

factories 

zero 

OC 

OC 

1,2-Dichloropropane 

Di(2-ethylhexyl) adipate 

0.005 

0.4 

Increased risk of cancer 

Weight loss, liver problems, or possible 

reproductive	difficulties

Discharge from industrial chemical 

factories 

Discharge from chemical factories 

zero 

0.4 

OC Di(2-ethylhexyl)	

phthalate 

0.006	 Reproductive	difficulties;	liver	problems;	

increased risk of cancer 

Discharge	from	rubber	and	chemical	

factories 

zero

OC 

OC 

OC 

Dinoseb	

Dioxin	(2,3,7,8-TCDD)	

Diquat 

0.007	

0.00000003	

0.02 

Reproductive	difficulties	

Reproductive	difficulties;	increased	risk	

of cancer 

Cataracts 

Runoff	from	herbicide	used	on	soybeans	

and vegetables 

Emissions	from	waste	incineration	

and other combustion; discharge

from chemical factories 

Runoff from herbicide use 

0.007
 

zero
 

0.02 

OC Endothall 0.1 Stomach and intestinal problems Runoff from herbicide use 0.1 

OC Endrin 0.002 Liver problems Residue of banned insecticide 0.002
 

OC Epichlorohydrin TT4 Increased cancer risk; stomach problems 

 

Discharge from industrial chemical 

factories; an impurity of some water

treatment chemicals 

zero
 

OC Ethylbenzene	 0.7	 Liver	or	kidney	problems	 Discharge	from	petroleum	refineries	 0.7

 

OC 

M 

Ethylene	dibromide	

Fecal	coliform	and	

E. coli 

0.00005	

MCL6

Problems	with	liver,	stomach,	reproductive	 Discharge	from	petroleum	refineries	

system, or kidneys; increased risk of cancer 

Fecal	coliforms	and	E. coli are bacteria whose Human and animal fecal waste 

presence indicates that the water may be contaminated 

with	human	or	animal	wastes.	Microbes	in	these	wastes		

zero

zero6 

 

	

may cause short term effects, such as diarrhea, cramps,

nausea, headaches, or other symptoms. They may pose a

special health risk for infants, young children, and people

with severely compromised immune systems. 

IOC 

M 

OC 

Fluoride	

Giardia lamblia 

Glyphosate	

4.0	

TT7

0.7	

Bone	disease	(pain	and	tenderness	of	

the bones); children may get mottled 

teeth 

Short-term	exposure:	Gastrointestinal	illness	

(e.g., diarrhea, vomiting, cramps) 

Kidney	problems;	reproductive	

difficulties

Water	additive	which	promotes	

strong teeth; erosion of natural

deposits; discharge from fertilizer

and aluminum factories 

Human	and	animal	fecal	waste	

Runoff	from	herbicide	use	

4.0

zero

0.7

DBP 

OC 

OC 

M 

Haloacetic acids 

(HAA5) 

Heptachlor 

Heptachlor epoxide 

Heterotrophic plate 

count (HPC) 

0.060 

0.0004 

0.0002 

TT7

Increased risk of cancer	 

Liver damage; increased risk of cancer	 

Liver damage; increased risk of cancer	 

HPC has no health effects; it is an 

analytic method used to measure the 

variety of bacteria that are common in 

water. The lower the concentration of 

Byproduct of drinking water

disinfection 

Residue of banned termiticide 

Breakdown of heptachlor 

HPC measures a range of bacteria

that are naturally present in the

environment 

n/a9 

zero 

zero 

n/a 

bacteria in drinking water, the better

maintained the water system is. 

LEGEND 

D Disinfectant IOC Inorganic Chemical OC Organic Chemical 

DBP Disinfection Byproduct M Microorganism R Radionuclides
Contaminant MCL or Potential health effects from Common sources of contaminant Public Health
 

 TT1 (mg/L)2 long-term3 exposure above the MCL in drinking water Goal (mg/L)2
 

OC Hexachlorobenzene	 0.001	 Liver	or	kidney	problems;	reproductive	 Discharge	from	metal	refineries	and	 zero

difficulties;	increased	risk	of	cancer	 agricultural	chemical	factories

OC Hexachlorocyclopentadiene 0.05 Kidney or stomach problems Discharge from chemical factories 0.05 

IOC Lead TT5; Infants and children: Delays in physical or Corrosion of household plumbing zero 

Action or mental development; children could systems; erosion of natural deposits 

Level=0.015	 show	slight	deficits	in	attention	span

and learning abilities; Adults: Kidney

problems; high blood pressure 

M Legionella TT7	 Legionnaire’s	Disease,	a	type	of	 Found	naturally	in	water;	multiplies	in	 zero

pneumonia heating systems 

OC Lindane 0.0002 Liver or kidney problems Runoff/leaching from insecticide used 0.0002 

on cattle, lumber, gardens 

IOC Mercury	(inorganic)	 0.002	 Kidney	damage	 Erosion	of	natural	deposits;	discharge	 0.002

from	refineries	and	factories;

runoff	from	landfills	and	croplands

OC Methoxychlor	 0.04	 Reproductive	difficulties	 Runoff/leaching	from	insecticide	used	 0.04

on fruits, vegetables, alfalfa, livestock 

IOC Nitrate (measured as 10 Infants below the age of six months who Runoff from fertilizer use; leaching 10 

Nitrogen) drink water containing nitrate in excess from septic tanks, sewage; erosion of

of	the	MCL	could	become	seriously	ill	 natural	deposits

and, if untreated, may die. Symptoms

include shortness of breath and blue-baby

syndrome. 

IOC Nitrite (measured as 1 Infants below the age of six months who Runoff from fertilizer use; leaching 1 Nitrogen) drink water containing nitrite in excess from septic tanks, sewage; erosion of

of	the	MCL	could	become	seriously	ill	 natural	deposits

and, if untreated, may die. Symptoms

include shortness of breath and blue-baby

syndrome. 

OC Oxamyl (Vydate) 0.2 Slight nervous system effects Runoff/leaching from insecticide used 0.2 

on apples, potatoes, and tomatoes 

OC Pentachlorophenol 0.001 Liver or kidney problems; increased Discharge from wood-preserving zero 

cancer risk factories 

OC Picloram 0.5 Liver problems Herbicide runoff 0.5 

OC Polychlorinated	biphenyls	 0.0005	 Skin	changes;	thymus	gland	problems;	 Runoff	from	landfills;	discharge	of	 zero

(PCBs)	 immune	deficiencies;	reproductive	or	 waste	chemicals

nervous	system	difficulties;	increased	

risk of cancer 

R Radium 226 and 5 pCi/L Increased risk of cancer Erosion of natural deposits zero 

Radium	228	(combined)

IOC Selenium	 0.05	 Hair	or	fingernail	loss;	numbness	in	fingers	 Discharge	from	petroleum	and	metal	refineries;	 0.05

or toes; circulatory problems erosion of natural deposits; discharge

from mines 

 OC Simazine 0.004 Problems with blood Herbicide runoff 0.004 

OC Styrene 0.1 Liver, kidney, or circulatory system problems Discharge from rubber and plastic 0.1 

factories;	leaching	from	landfills

OC Tetrachloroethylene 0.005 Liver problems; increased risk of cancer Discharge from factories and dry cleaners zero 

IOC Thallium 0.002 Hair loss; changes in blood; kidney, intestine, Leaching from ore-processing sites; 0.0005 

or liver problems discharge from electronics, glass,

and drug factories 

OC Toluene 1 Nervous system, kidney, or liver problems Discharge from petroleum factories 1 

M Total Coliforms 5.0 Coliforms are bacteria that indicate that other, Naturally present in the environment zero 

percent8 potentially harmful bacteria may be present.

See fecal coliforms and E. coli 

DBP Total	Trihalomethanes	 0.080	 Liver,	kidney	or	central	nervous	system	problems;	 Byproduct	of	drinking	water	disinfection	 n/a9 

(TTHMs)	 increased	risk	of	cancer	

OC Toxaphene 0.003 Kidney, liver, or thyroid problems; Runoff/leaching from insecticide used zero increased risk of cancer on cotton and cattle 

OC 2,4,5-TP (Silvex) 0.05 Liver problems Residue of banned herbicide 0.05 

OC 1,2,4-Trichlorobenzene	 0.07	 Changes	in	adrenal	glands	 Discharge	from	textile	finishing	 0.07

factories 

OC 1,1,1-Trichloroethane 0.2 Liver, nervous system, or circulatory Discharge from metal degreasing 0.2 

problems sites and other factories 

OC 1,1,2-Trichloroethane 0.005 Liver, kidney, or immune system Discharge from industrial chemical 0.003 

problems factories 

OC Trichloroethylene 0.005 Liver problems; increased risk of cancer Discharge from metal degreasing zero sites and other factories 

LEGEND 

D Disinfectant IOC Inorganic Chemical OC Organic Chemical 

DBP Disinfection Byproduct M Microorganism R Radionuclides
Contaminant 

 

MCL or 

TT1 (mg/L)2 

Potential health effects from 

long-term3 exposure above the MCL 

Common sources of contaminant 

in drinking water 

Public Health
 

Goal (mg/L)2
 

M Turbidity TT7 Turbidity is a measure of the cloudiness of water. Soil runoff n/a 

It	is	used	to	indicate	water	quality	and	filtration

effectiveness (e.g., whether disease-causing organisms

are present). Higher turbidity levels are often associated

with higher levels of disease-causing microorganisms

such as viruses, parasites and some bacteria. These

organisms can cause short term symptoms such as

nausea, cramps, diarrhea, and associated headaches. 

R Uranium 30μg/L Increased risk of cancer, kidney toxicity Erosion of natural deposits zero OC Vinyl chloride 0.002 Increased risk of cancer Leaching from PVC pipes; discharge zero 

from plastic factories 

M Viruses (enteric) TT7 Short-term	exposure:	Gastrointestinal	illness	 Human	and	animal	fecal	waste		 zero

(e.g., diarrhea, vomiting, cramps) 

OC Xylenes (total) 10 Nervous system damage Discharge from petroleum factories; 10 

discharge from chemical factories 

LEGEND 

D Disinfectant IOC Inorganic Chemical OC Organic Chemical 

DBP Disinfection Byproduct M Microorganism R Radionuclides
NOTES 

1 Definitions 

•	 Maximum	Contaminant	Level	Goal	(MCLG)—The	level	of	a	contaminant	in	drinking	water	below •	 Viruses:	99.99	percent	removal/inactivation

which	there	is	no	known	or	expected	risk	to	health.	MCLGs	allow	for	a	margin	of	safety	and	are •	 Legionella:	No	limit,	but	EPA	believes	that	if	Giardia	and	viruses	are	removed/inactivated	according

non-enforceable	public	health	goals. to	the	treatment	techniques	in	the	surface	water	treatment	rule,	Legionella	will	also	be	controlled.

•	 Maximum	Contaminant	Level	(MCL)—The	highest	level	of	a	contaminant	that	is	allowed	in •	 Turbidity:	For	systems	that	use	conventional	or	direct	filtration,	at	no	time	can	turbidity	(cloudiness	of

drinking	water.	MCLs	are	set	as	close	to	MCLGs	as	feasible	using	the	best	available	treatment	 water)	go	higher	than	1	nephelolometric	turbidity	unit	(NTU),	and	samples	for	turbidity	must	be

technology	and	taking	cost	into	consideration.	MCLs	are	enforceable	standards. less	than	or	equal	to	0.3	NTU	in	at	least	95	percent	of	the	samples	in	any	month.	Systems	that	use

•	 Maximum	Residual	Disinfectant	Level	Goal	(MRDLG)—The	level	of	a	drinking	water	disinfectant	 filtration	other	than	conventional	or	direct	filtration	must	follow	state	limits,	which	must	include	turbidity

below	which	there	is	no	known	or	expected	risk	to	health.	MRDLGs	do	not	reflect	the	benefits	of	 at	no	time	exceeding	5	NTU.

the	use	of	disinfectants	to	control	microbial	contaminants. •	 HPC:	No	more	than	500	bacterial	colonies	per	milliliter

•	 Maximum	Residual	Disinfectant	Level	(MRDL)—The	highest	level	of	a	disinfectant	allowed	in	 •	 Long	Term	1	Enhanced	Surface	Water	Treatment;	Surface	water	systems	or	ground	water	systems

drinking	water.	There	is	convincing	evidence	that	addition	of	a	disinfectant	is	necessary	for under	the	direct	influence	of	surface	water	serving	fewer	than	10,000	people	must	comply	with	the	

control	of	microbial	contaminants. applicable	Long	Term	1	Enhanced	Surface	Water	Treatment	Rule	provisions	(e.g.	turbidity	standards,

•	 Treatment	Technique	(TT)—A	required	process	intended	to	reduce	the	level	of	a	contaminant	in	 individual	filter	monitoring,	Cryptosporidium	removal	requirements,	updated	watershed	control

drinking	water. requirements	for	unfiltered	systems).

2	Units	are	in	milligrams	per	liter	(mg/L)	unless	otherwise	noted.	Milligrams	per	liter	are	equivalent	 •	 Long	Term	2	Enhanced	Surface	Water	Treatment;	This	rule	applies	to	all	surface	water	systems

to	parts	per	million	(ppm). or	ground	water	systems	under	the	direct	influence	of	surface	water.	The	rule	targets	additional

3	Health	effects	are	from	long-term	exposure	unless	specified	as	short-term	exposure. Cryptosporidium	treatment	requirements	for	higher	risk	systems	and	includes	provisions	to	reduce

4 Each	water	system	must	certify	annually,	in	writing,	to	the	state	(using	third-party	or	manufacturers risks	from	uncovered	finished	water	storages	facilities	and	to	ensure	that	the	systems	maintain	microbial

certification)	that	when	it	uses	acrylamide	and/or	epichlorohydrin	to	treat	water,	the	combination	(or	 protection	as	they	take	steps	to	reduce	the	formation	of	disinfection	byproducts.	(Monitoring

product)	of	dose	and	monomer	level	does	not	exceed	the	levels	specified,	as	follows:	Acrylamide	 start	dates	are	staggered	by	system	size.	The	largest	systems	(serving	at	least	100,000

=	0.05	percent	dosed	at	1	mg/L	(or	equivalent);	Epichlorohydrin	=	0.01	percent	dosed	at	20	mg/L	 people)	will	begin	monitoring	in	October	2006	and	the	smallest	systems	(serving	fewer	than

(or	equivalent). 10,000	people)	will	not	begin	monitoring	until	October	2008.	After	completing	monitoring	and

5 Lead	and	copper	are	regulated	by	a	Treatment	Technique	that	requires	systems	to	control	the determining	their	treatment	bin,	systems	generally	have	three	years	to	comply	with	any	additional

corrosiveness	of	their	water.	If	more	than	10	percent	of	tap	water	samples	exceed	the	action	level,	 treatment	requirements.)

water	systems	must	take	additional	steps.	For	copper,	the	action	level	is	1.3	mg/L,	and	for	lead	is	 •	 Filter	Backwash	Recycling:	The	Filter	Backwash	Recycling	Rule	requires	systems	that	recycle	to	

0.015	mg/L. return	specific	recycle	flows	through	all	processes	of	the	system’s	existing	conventional	or	direct	

6	A	routine	sample	that	is	fecal	coliform-positive	or	E. coli-positive	triggers	repeat	samples--if	any filtration	system	or	at	an	alternate	location	approved	by	the	state.

repeat	sample	is	total	coliform-positive,	the	system	has	an	acute	MCL	violation.	A	routine	sample 8	No	more	than	5.0	percent	samples	total	coliform-positive	in	a	month.	(For	water	systems	that	collect	

that	is	total	coliform-positive	and	fecal	coliform-negative	or	E. coli-negative	triggers	repeat	samples--if fewer	than	40	routine	samples	per	month,	no	more	than	one	sample	can	be	total	coliform-positive	

any	repeat	sample	is	fecal	coliform-positive	or	E. coli-positive,	the	system	has	an	acute	MCL	violation. per	month.)	Every	sample	that	has	total	coliform	must	be	analyzed	for	either	fecal	coliforms	or

See	also	Total	Coliforms. E. coli.	If	two	consecutive	TC-positive	samples,	and	one	is	also	positive	for	E. coli	or	fecal	coliforms,	

7	EPA’s	surface	water	treatment	rules	require	systems	using	surface	water	or	ground	water	under	 system	has	an	acute	MCL	violation.

the	direct	influence	of	surface	water	to	(1)	disinfect	their	water,	and	(2)	filter	their	water	or	meet 9	Although	there	is	no	collective	MCLG	for	this	contaminant	group,	there	are	individual	MCLGs	for	

criteria	for	avoiding	filtration	so	that	the	following	contaminants	are	controlled	at	the	following	levels: some	of	the	individual	contaminants:

•	 Cryptosporidium:	99	percent	removal	for	systems	that	filter.	Unfiltered	systems	are	required	to •	 Haloacetic	acids:	dichloroacetic	acid	(zero);	trichloroacetic	acid	(0.3	mg/L)

include	Cryptosporidium	in	their	existing	watershed	control	provisions. •	 Trihalomethanes:	bromodichloromethane	(zero);	bromoform	(zero);	dibromochloromethane	(0.06	mg/L)

•	 Giardia	lamblia:	99.9	percent	removal/inactivation
National Secondary Drinking

Water Regulation 

National Secondary Drinking Water Regulations are non-enforceable guidelines regarding 

contaminants that may cause cosmetic effects (such as skin or tooth discoloration) or aesthetic effects (such as taste, odor, or color) in drinking water. EPA recommends secondary 

standards to water systems but does not require systems to comply. However, some states 

may choose to adopt them as enforceable standards. 

Contaminant Secondary Maximum Contaminant Level 

Aluminum 0.05 to 0.2 mg/L 

Chloride 250 mg/L 

Color 15 (color units) 

Copper 1.0 mg/L 

Corrosivity noncorrosive 

Fluoride 2.0 mg/L 

Foaming Agents 0.5 mg/L 

Iron 0.3 mg/L 

Manganese 0.05 mg/L 

Odor 3 threshold odor number 

pH 6.5-8.5 

Silver 0.10 mg/L 

Sulfate 250 mg/L 

Total Dissolved Solids 500 mg/L 

Zinc 5 mg/L 

For More Information 

EPA’s Safe Drinking Water Web site: 

http://www.epa.gov/safewater/ 

EPA’s Safe Drinking Water Hotline: 

(800) 426-4791 

To order additional posters or other 

ground water and drinking water 

publications, please contact the 

National Service Center for 

Environmental Publications at : 

 (800) 490-9198, or 

 email: nscep@bps-lmit.com. 

EPA 816-F-09-004
 

May 2009